If you are asking if a maxima motor will fit in a G20, then I would stay away from a GTi-R or a VE motor. Someone who thinks a V6 motor "be sick" should not put a motor in their car with no replacement parts available. But hey its your dream but when u decide to do it I have a pulsar motor I'm willing to let go of
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1991 Infiniti G20
1992 Nissan Sentra SE-R
1995 Nissan 200SX SE-R
1993 Nissan NX-2000